Acoelomorph flatworms are deuterostomes related to Xenoturbella.
Acoelomorph flatworms are deuterostomes related to Xenoturbella.
复制标题
DOI：
10.1038/nature09676
复制
发表时间：
2011-02-10
期刊：
影响因子：
64.8
通讯作者：
Telford, Maximilian J.
中科院分区：
文献类型：
--
作者：
Philippe, Herve;Brinkmann, Henner;Copley, Richard R.;Moroz, Leonid L.;Nakano, Hiroaki;Poustka, Albert J.;Wallberg, Andreas;Peterson, Kevin J.;Telford, Maximilian J.
异锥虫目和无腔虫目是有争议的海洋蠕虫祖先。两者最初都与扁形虫（扁形动物）有关，但分子数据已经修正了它们的系统发育位置，通常将Xenoturbellida与后口动物联系起来，并将Acoelomorpha定位为最基部分支的两侧类群。最近的基因组数据表明，Xenoturbellida和Acoelomorpha是姐妹类群，并共同构成了一个早枝的Bilateria。在这里，我们组装了三个独立的数据集-线粒体基因，一个38，330个氨基酸位置和新的microRNA（miRNA）互补的基因组数据集-并表明Acoelomorpha的位置受到长枝吸引力（LBA）人工制品的强烈影响。当我们尽量减少LBA，我们发现一致支持的立场acoelomorphs和Xenoturbella内的后口。最有可能的同源性将Xenoturbella和Acoelomorpha联系在一起，我们称之为Xenacoelomorpha。Xenacoelomorpha是Ambulacraria（半索动物和棘皮动物）的姐妹群。我们发现，分析的miRNA补体已受到影响的字符损失的acoels和两组拥有一个miRNA和基因Rsb 66，否则特定的后口动物。此外，Xenoturbella与步肢动物共享一个miRNA，与acoels共享两个。这一进化过程解释了Xenoturbellida和Acoelomorpha的共同特征，如纤毛超微结构和弥散神经系统，并意味着Xenacoelomorpha中各种后口特征的丧失，包括体腔，通过肠道和鳃缝。
Xenoturbellida and Acoelomorpha are marine worms with contentious ancestry. Both were originally associated with the flatworms (Platyhelminthes), but molecular data haverevised their phylogenetic positions, generally linking Xenoturbellida to the deuterostomes and positioning the Acoelomorpha as the most basally branching bilaterian group(s). Recent phylogenomic data suggested that Xenoturbellida and Acoelomorpha are sister taxa and together constitute an early branch of Bilateria. Here we assemble three independent data sets—mitochondrial genes, a phylogenomic data set of 38,330 amino-acid positions and new microRNA (miRNA) complements—and show that the position of Acoelomorpha is strongly affected by a long-branch attraction (LBA) artefact. When we minimize LBA we find consistent support for a position of both acoelomorphs and Xenoturbella within the deuterostomes. The most likely phylogeny links Xenoturbella and Acoelomorpha in a clade we call Xenacoelomorpha. The Xenacoelomorpha is the sister group of the Ambulacraria (hemichordates and echinoderms). We show that analyses of miRNA complements have been affected by character loss in the acoels and that both groups possess one miRNA and the gene Rsb66 otherwise specific to deuterostomes. In addition, Xenoturbella shares one miRNA with the ambulacrarians, and two with the acoels. This phylogeny makes sense of the shared characteristics of Xenoturbellida and Acoelomorpha, such as ciliary ultrastructure and diffuse nervous system, and implies the loss of various deuterostome characters in the Xenacoelomorpha including coelomic cavities, through gut and gill slits.
登录
查看更多内容
影响因子：
10.7
作者：
Castresana, J
通讯作者：
Castresana, J
影响因子：
14.9
作者：
Abascal F;Zardoya R;Telford MJ
通讯作者：
Telford MJ
Acoel Flatems不是PlatyHelminthes：系统基因组学的证据。
影响因子：
3.7
作者：
Philippe, Herve;Brinkmann, Henner;Martinez, Pedro;Riutort, Marta;Baguna, Jaume
通讯作者：
Baguna, Jaume
影响因子：
13.8
作者：
Jeanmougin, F;Thompson, JD;Gibson, TJ
通讯作者：
Gibson, TJ
影响因子：
3.7
作者：
Egger B;Steinke D;Tarui H;De Mulder K;Arendt D;Borgonie G;Funayama N;Gschwentner R;Hartenstein V;Hobmayer B;Hooge M;Hrouda M;Ishida S;Kobayashi C;Kuales G;Nishimura O;Pfister D;Rieger R;Salvenmoser W;Smith J;Technau U;Tyler S;Agata K;Salzburger W;Ladurner P
通讯作者：
Ladurner P